Uninstalling the ATI Linux Proprietary Driver
         Uninstalling the ATI Linux Proprietary Driver is dependent on 
			the mode of the initial installation.
    Automatic or Custom Driver Installations
         If the ATI Proprietary Linux Driver was installed using either 
         the Automatic or Custom options, then do the following:
         1    Launch the Terminal Application/Window and navigate to 
         	the /usr/share/ati folder. With superuser permissions, enter 
         	the command "sh ./fglrx-uninstall.sh".
         2  Reboot your system.
         3  You have now successfully uninstalled the ATI Linux 
            Proprietary Driver.
         
    Package Generation
         If the initial installation of the driver was done via the 
         Operating Systems package management software (RPM, APT, etc.) 
         then please use that package management software to remove 
         the ATI Proprietary Linux Driver.

		In order to restore the system to the previous state before the 
		last installation, the original configuration file needs to be 
		restored manually. Without that, Xorg may fail to start
		properly after uninstalling the driver and rebooting the system.

		To restore the original Xorg configuration file:
		1    Locate backup configuration files: ls /etc/X11/xorg.conf.original-*
		     Take the latest version with the highest number and copy it over the existing
		2
		     xorg.conf file: cp /etc/X11/xorg.conf.original-<number> /etc/X11/xorg.conf

		After that it is safe to reboot the system and it will start up 
		using the open-source driver that ships with the OS.

( see http://support.amd.com/us/gpudownload/linux/Pages/radeon_linux.aspx?type=2.4.1&product=2.4.1.3.38&lang=us&rev=10.5&ostype=Linux%20x86 )